Geochronological and Geochemical Constraints of Chidong Silurian Gabbroic Pluton in Yunkai Domain and Its Tectonic Implications
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摘要: 华南陆块早古生代的构造属性是华南地质研究争论的焦点,主要有洋-陆俯冲/碰撞和陆内构造两种观点之争.而华南陆块早古生代岩浆岩的报道以花岗质岩石为主,对构造指示意义更为明确的同期镁铁质岩浆岩则研究较少,且对已发现的少量早古生代镁铁质岩浆岩的岩石成因也颇具争议.为了更好地限定华南早古生代的构造属性,对云开地区新近识别出的池垌辉长岩体开展了详细的野外地质、年代学和地球化学研究.其SIMS锆石U-Pb年代学测试得到其206Pb/238U加权平均年龄为433.9±1.5 Ma,代表其结晶年龄.样品具较低的SiO2含量(47.81%~48.83%),高的MgO含量(13.02%~14.65%)、Cr含量(278×10-6~356×10-6)和Ni含量(120×10-6~184×10-6),富集大离子亲石元素、亏损高场强元素.(87Sr/86Sr)i=0.708 5~0.710 7,εNd(t)=-6.0~-8.2,显示EMⅡ型富集地幔的Sr-Nd同位素特征.结合区域Lu-Hf同位素、古生物、古水流等地质资料,云开地区志留纪时期发育一个受古老俯冲交代作用影响的地幔楔,该地幔楔源区在华南广西运动期间才受到热扰动而部分熔融.认为池垌辉长岩是在早古生代华南陆内造山后的伸展背景下由古老俯冲交代地幔楔熔融而成的产物.Abstract: The geodynamic mechanisms of the Early Paleozoic orogeny in the South China block (SCB) remain highly debated, and two major models involving subduction-collision orogeny and intra-continental orogeny have been proposed. The Early Paleozoic granitic rocks are widely developed in the eastern SCB and the synchronous mafic rocks have recently been reported.However, the petrogenesis of these Early Paleozoic mafic rocks are still controversial, thus hindering our understanding for the Early Paleozoic tectonic setting. In this study, it presents new petrographic, geochronological and geochemical data for the Chidong gabbroic pluton in the Yunkai domain.The representative sample for the gabbric pluton yields a SIMS zircon U-Pb age of 433.9±1.5 Ma (MSWD=0.18). They have SiO2 of 47.81%-48.83%, MgO of 13.02%-14.65%, Cr of 278×10-6-356×10-6 and Ni of 120×10-6-184×10-6.They are enriched in large ion lithophile elements with significantly negative Nb-Ta and Ti anomalies.These samples show EMⅡ-like geochemical affinities with high initial 87Sr/86Sr ratios (0.708 5 to 0.710 7) and low εNd(t) values (-6.0 to -8.2), suggestive of derivation from a paleosubduction-modified wedge beneath the Yunkai Domain. The wedge was undisturbed until Silurian and the Kwangsian igneous rocks in the SCB were associated with the intra-continental orogenism rather than the subduction and subsequent collision.
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Key words:
- South China block /
- Yunkai Domain /
- Chidong gabbroic pluton /
- intra-continental orogeny /
- geochemistry /
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图 3 池垌辉长岩样品TAS图解(a)和SiO2-K2O图解(b)
图a据Wilson(1989),图b据Morrison(1980)修改
Fig. 3. TAS diagram (a) and SiO2-K2O diagram (b) for the Chidong gabbroic samples
图 4 池垌辉长岩样品稀土元素球粒陨石标准化图解(a)和微量元素原始地幔标准化配分图(b)
球粒陨石、原始地幔、OIB及MORB数据引自Sun and McDonough(1989)
Fig. 4. Chondrite-normalized REE patterns diagram (a) and primitive mantle-normalized spidergram (b) for the Chidong gabbroic samples
图 5 池垌辉长岩体的(87Sr/86Sr)i-εNd(t)图解(a)、La/Nb-Nb/Th图解(b)、Nb×100/Zr-Th×100/Zr图解(c)和Th/Nb-Ba/Nb图解(d)
龙虎岗岩体数据据Wang et al.(2013b),云炉岩体数据据彭松柏等(2006a),竹雅岩体和石板岩体数据据彭松柏等(2006a)和周岱等(2017b)
Fig. 5. (87Sr/86Sr)i-εNd(t) diagram (a), La/Nb-Nb/Th diagram (b), Nb×100/Zr-Th×100/Zr diagram (c) and Th/Nb-Ba/Nb diagram (d) for the Chidong gabbroic samples
表 1 池垌辉长岩样品主量元素(%)、微量元素(10-6)分析结果
Table 1. Major (%) and trace (10-6) element analytical results for the Chidong gabbroic samples
样号 CD-4 CD-5 CD-8 CD-10 CD-12 CD-15 SiO2 48.38 48.53 48.83 47.81 47.94 48.05 TiO2 0.38 0.37 0.34 0.29 0.28 0.43 Al2O3 12.98 11.40 12.10 14.28 13.12 11.79 FeOT 9.52 10.30 9.66 9.38 10.07 10.13 MgO 13.80 14.65 14.13 13.02 13.97 14.32 MnO 0.18 0.20 0.18 0.17 0.19 0.19 CaO 7.63 8.21 7.96 8.99 8.51 8.90 K2O 1.34 0.96 1.19 1.17 0.90 0.62 Na2O 0.82 0.72 1.06 1.08 0.97 0.98 P2O5 0.02 0.03 0.02 0.01 0.01 0.02 L.O.I 3.35 2.92 2.94 2.21 2.35 2.91 Total 99.45 99.44 99.49 99.47 99.43 99.46 Mg# 72.3 71.9 72.5 71.4 71.4 71.8 Sc 39.6 43.1 41.3 38.3 38.5 42.5 V 188 203 185 175 173 209 Cr 278 291 292 327 356 278 Co 57.5 63.8 61.7 64.4 64.1 62.5 Ni 135 133 134 175 184 120 Rb 66.1 46.3 62.7 55.8 43.9 30.9 Sr 93.0 85.6 107 153 111 96.5 Y 9.79 9.31 9.32 7.76 7.10 9.65 Zr 24.8 23.9 28.4 18.4 18.9 32.5 Nb 1.22 1.39 1.26 0.97 0.79 1.30 Ba 120 102 104 120 97.4 63.6 La 3.25 4.24 4.09 3.17 2.79 3.52 Ce 6.89 8.42 8.08 5.62 5.12 7.25 Pr 1.00 1.08 1.06 0.81 0.71 0.96 Nd 3.95 4.72 4.59 3.40 3.10 3.97 Sm 1.14 1.15 1.17 0.89 0.81 1.16 Eu 0.34 0.35 0.33 0.31 0.28 0.36 Gd 1.42 1.38 1.41 1.14 1.04 1.39 Tb 0.25 0.24 0.25 0.20 0.18 0.26 Dy 1.55 1.51 1.50 1.23 1.11 1.59 Ho 0.33 0.33 0.33 0.27 0.25 0.34 Er 0.99 0.98 0.97 0.81 0.77 1.02 Tm 0.15 0.15 0.15 0.12 0.11 0.15 Yb 0.96 0.98 0.98 0.81 0.77 1.00 Lu 0.14 0.15 0.15 0.12 0.12 0.15 Hf 0.70 0.77 0.75 0.53 0.53 0.84 Ta 0.10 0.12 0.10 0.11 0.06 0.09 Pb 3.56 14.5 9.23 3.28 2.85 4.19 Th 0.98 1.01 1.14 0.71 0.76 1.05 U 0.23 0.26 0.36 0.21 0.17 0.28 表 2 池垌辉长岩样品Sr-Nd同位素分析结果
Table 2. Sr-Nd isotopic results for the Chidong gabbroic samples
样号 87Rb/86Sr 87Sr/86Sr ±2σ (87Sr/86Sr)i 147Sm/144Nd 143Nd/144Nd ±2σ (143Nd/144Nd)t εNd(t) CD-10 1.056 0.717 185 14 0.710 660 0.158 0.512 221 18 0.511 772 -6.0 CD-4 2.058 0.721 194 14 0.708 477 0.174 0.512 153 17 0.511 658 -8.2 注:采用加权平均年龄434 Ma求得样品Sr、Nd同位素的初始比值.参数采用λ(87Rb)=1.42×10-11(a-1),λ(147Sm)=6.54×10-12(a-1) (Lugmair and Marti, 1978),(143Nd/144Nd)CHUR, 现在=0.512 638( Goldstein et al., 1984 ),(147Sm/144Nd)CHUR, 现在=0.196 7(Peucat et al., 1988 ). -
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